Humans, birds and fish can all be affected by PSP toxins. Herbivorous zooplankton is the primary transvector which can in turn transmit the toxin to fish and possibly other marine creatures which consume zooplankton (Baden 1983). The usual route for humans is the consumption of raw or cooked contaminated shellfish.
The definition of obstinate is extremely stubborn and determined to have your own way. An example of obstinate is a person who drives during a severe hurricane despite major warnings not to do so. obstinate. not easily subdued, ended, etc. obstinate.
Definition of Sestina. A sestina is a fixed form in poetry that has six stanzas of six lines each followed by a three-line stanza; each line ends with one of six words in a standard repetition. These six words are chosen by the poet, but must be repeated in a certain order for the poem to qualify as a sestina.